The invention discloses a measurer used for total hip replacement arthroplasty in the orthopedics department, and relates to the technical field of medical instruments. The aim is to improve the precision of the arthroplasty. The measurer comprises a measuring base, a transverse measure gauge capable of sliding in the left-and-right direction is transversely arranged on the measuring base, and a vertical measure gauge capable of sliding in the vertical direction is vertically arranged on the measuring base; the transverse measure gauge and the vertical measure gauge are straight gauges used for measuring lengths, and a measure gauge locking part used for locking the transverse measure gauge and the vertical measure gauge is arranged on the measuring base; a positioning rod capable of sliding in the vertical direction is vertically arranged at the right end of the transverse measure gauge, a tension measure spring is arranged on the transverse measure gauge, and a dial indicator used for detecting the elasticity of the tension measure spring is arranged on the measuring base. The measurer is suitable for measuring the length of a limb, eccentric distance and soft tissue tension of glutenus medius in the total hip replacement arthroplasty in the orthopedics department.